How can I access the request body within the Middleware onResponse?

[eshlox]

I'm trying to create a middleware that retries a request when it returns a 401 status code. I've already created a functional version that refreshes tokens and can retry GET requests. However, I'm unable to access the POST request body within the onResponse function. My goal is to update a header and retry the request. Is there a built-in way to achieve this? 🤔